Feeling Old?!?! Please Help My Feelings...

My husband said yesterday, how you gonna feel when you have a 9 yr old at 40? I was in total depress mode bc my head is not wrapped around being in my 30's yet lol and My first baby just turned 1 and I just turned 32... Why am I feeling old? Is it bc I started late (due to infertility).... I always wanted to be so young with my kids but I feel like I'll be a oldie and their friends will make fun of me...?