First time mom not planning for more?

I am first time mom my little guy is 7 weeks old. I am 36 and thinking that I don't want to have more children. Not because I dont want more but due to my age, finances and the higher risk of baby having DS and or other issues. I'm happy with my boy I adore him and want to make his life amazing. Just wondering if there are any other FTM In my age group or not that feel the same?