Size,age,shape have no meaning in airsoft. Well apart from the fact that if you are big and slow you make a better target for me who is also big and slow ?
That describes quite a lot of airsofters. As others have posted, play the way that suits you and leave the charging around to those who are fitter/jacked up on monster
Early 50s, extra lockdown padding, unfit, screwed knees, wonky ribs, multi directional spine, cracked skull, only occasionally smoked socially decades ago (and others would benefit from the free leftovers of the pack at evening end)
Shooting people & getting shot is fun and a lot safer then other things I’ve done in life