Asuming this means fetishes so here are the ones I know of for myself,
Fat/WG: When I was 10 I realized, though the earliest sign I can think of was when I was 4-5.
Inflation: Around the same time as fat/wg altho no real possible signs.
Pregnancy: I like it a bit so when I was 17, no earlier sig- earliest sign at 12.
Vore: When I was 11, no earlier signs.
Non-fatal/revival popping/bursting: When I was 8, I really enjoyed this comic dub on youtube.
That's all I can think of for now, if you think of any others feel free to ask about them.