I've just found this thread & it makes very interesting reading.
Both DS are adults, but at 21 & 19 both students, so I'm not reducing what I spend. They have the same as DS3 who is 13. £400 each plus £50 for a stocking (the little bits add up).
DS1 Solovair boots he's chosen; a 2nd hand turntable (surprise), football top, cool tshirt he'll like & stocking of mainly lovely food/ cooking bits.
DS2 annual cinema pass, Levi jacket, cool tshirt, rugby bits, football tops, Lego & stocking of favourite pants, asked for socks & favourite sweets.
Last year we paid £400 for a surf holiday with university for DS1, & DS2 got the same amount towards inter-railing. I'd rather that kind of thing tbh.
I suppose I should start to think about once they're earning what I'll reduce to. DS1 will graduate next Summer, so perhaps next Christmas is the time to do it for him? I also buy for his gf, but set a £50 limit.
I spend the same for their birthday. It feels weird to not treat them. Both great kids who don't ask for anything & support themselves at uni.