hehe....before i start...i am no old pro...
exp wise....when working with young ppl, interaction with them is very important....
this is the age when they will feel very self conscious, for the younger ones shy, the 16-20 ones will be the most spontaneous, the 21-25 age group will probably feel that its a chore.... this is if these ppl u are shoot are not experienced in modeling...i.e ya everday ppl.... not really foolproof....depends on individuals really....
clothes wise, dress them to their age is the best....if possible let them dress in their own clothes....they will feel more comfortable this way.....
hmmm....dunno wat else also....the ppl i mostly work with are from 17-25 haha.....else its like under 3 years old....
cheers.....