S.C.
I have a 20 month old and 4 year old boy. I see both sides. My boys love to play with each other. But, my youngest also seems to enjoy playing with kids his own age. I think it's good for them to have peers their own age too. I think once he stops taking that morning nap you'll have more opportunity to join a moms club. I am part of MOMSclub and MOPS. Both are great for moms and kids to interact with other kids their same age. www.momsclub.org and www.mops.org can help you find groups near you. The great thing you are doing is getting him involved with other kids, reguarless of age, social play is good at this age.