That's what I find in what follows:

Military Botswana Top of Page
Military branches:

Botswana Defense Force (includes an air wing) (2006)
Military service age and obligation:

** 18 is the apparent age of voluntary military service** ; the official qualifications for determining minimum age are unknown (2001)
Manpower available for military service:


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Note added at 2 hrs (2006-11-04 23:21:02 GMT)
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http://www.pg.com/science/skincare/Skin_tws_67.htm;jsessioni...

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Note added at 2 hrs (2006-11-04 23:21:49 GMT)
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The following is from the reference cited:

** Apparent age**

Although the skin is itself a protection against radiation, this protection brings with it consequences of its own, leading to an 'apparent age' that is greater than one's real age.
The appearance of an individual's face and hands are often used as a rapid measure of age. Comparing the appearance of the face and forearms with that of less exposed areas demonstrates the major differences between intrinsic and photoaged skin.

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Note added at 3 hrs (2006-11-04 23:36:17 GMT)
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Alsso, the last line of the question makes me think along this direction...

** Also praktisch ob der Alterseindruck dem Lebensalter entsprechend ist usw. **

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Note added at 3 hrs (2006-11-04 23:53:36 GMT)
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Here is another reference:

http://dukenews.duke.edu/2002/01/medart0102.html

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Following a short presentation, the students will disperse throughout the museum and select three portraits that interest them from 16 representational paintings. They will examine the images and fill out a worksheet that presents a framework for their observations. The worksheet categories include "figure," "clothing," "actions" and "setting."

Under figure, for instance, a student might note a person's stature, skin tone, ** apparent age** and whether hands are smooth or calloused from labor, "all of which should shed light on the subject of the painting and his or her circumstances," Causey said.

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Note added at 4 hrs (2006-11-05 01:27:03 GMT)
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I will also propose: "perceived age" based on the following:

Ziel dieser Arbeit ist die systematische Untersuchung der akustischen Eigenschaften von Stimmen erwachsener Sprecher, die vorrangig aus altersbedingten Änderungen am Larynx resultieren. Neben der alterstypischen Ausprägung stimmqualitativer Parameter wird auch ihre perzeptive Relevanz geprüft. Zur Untersuchung des Schwingungsverhaltens der Stimmlippen eignet sich die Analyse elektroglottographischer Daten (EGG) gehaltener Vokale, aber auch die Analyse von längeren, artikulatorisch komplexer gebildeten Signalabschnitten wie Wörtern und Sätzen. Aus diesen Analysen können Hypothesen über das Quellsignal abgeleitet werden, welche dann durch inverse Filterung des akustischen Signals gestützt bzw. validiert werden. Durch Resynthese soll versucht werden, in synthetischen Sprachbeispielen systematisch einen ** Alterseindruck (perzeptives Stimmalter) ** zu erzeugen. Kenntnisse über die Verteilung stimmqualitativer Parameter bezüglich des wahren (chronologischen) Alters der Sprecher sollen in der maschinellen Schätzung des Sprecheralters aus Sprachbeispielen zur Anwendung kommen.

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Résumé / Abstract
Objectives: to examine whether in older people ** perceived age ** is associated with risk of total mortality independent of chronological age. Design: prospective population-based study (Evergreen project) with mortality surveillance for 13 years after the baseline. Setting: face-to-face interview among community-dwelling residents of the city of Jyväskylä, Finland. Subjects: 395 men and 770 women aged 65-84 years at baseline.

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Note added at 4 hrs (2006-11-05 01:29:57 GMT)
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http://www.medicalnewstoday.com/medicalnews.php?newsid=45014

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Note added at 4 hrs (2006-11-05 01:30:50 GMT)
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"Until now, skin's overall homogeneity and color saturation received little attention among behavioral scientists. This study helps us better understand that wrinkles are not the only age cue. Skin tone and luminosity may be a major signal for mate selection and attractiveness, as well as ** perceived age, **" says lead researcher Dr. Karl Grammer, Founder and Scientific Director of the Ludwig-Boltzmann-Institute for Urban Ethology, University of Vienna, Austria.