im not an older mum, but I am a mum to an 11 year old, I have friends who are 10 years older than me, with kids 6-7 years younger than my DD. In the first few years, it does seem to make a difference, parents do sort of discuss it (or it was a topic of conversation when DD was 1/2/3 and at that point I can understand why it was a bit of a barrier to making friends, I wasnt in the same financial situation as most of the other parents I met)
But the past few years, it hasnt made one blind bit of difference, its only when age comes up, that there are people who say, GOD! YOURE YOUNG!!! and conversation moves on, or when another parent says, oh yeah, youre the same age as my eldest, but theres no real judgement that happens.
What is there really to judge? As long as you appear to be managing parenting responsibilities well, theres really no reason for people to draw any conclusion due to your age.