It's cuz younger guys have less of a fat pad and are more in shape. They haven't yet gotten married and poisoned by all the years of fast food making you and the wife FAT and killing your sex drive. Use it or lose it also. And on this site you're more likely to see the exhibitionist type and those who are above average. But it's all genetics and nutrition does play a role as well, but even though most of our food now is laced with growth hormones and such, and we are more unhealthy overall, not long ago our elders were eating much healthier food. So it's really all the dudes that are long dead that were packing the heat

Mine's getting bigger right now.

Young guys tend to be skinner making it look bigger (optical perception). Mine looks pretty big in most my photos for example as I always position the angle just right to not show my large thighs which "dwarf" how big my cock looks.

No but theres more youg guys who like photoshoping his pics so they add 1 or 2 extra inches maybe in these days youg guys tend to watch too much porn were the guys are +8inch and they feel insecure about their own size

The camera does lie

Probably slightly but remember if a young guy is hung like field mouse he isnt going to upload pics. Where as older guys are comfortable with their size

No, they're just good at using photoshop or using someone elses photos.