So my son turned 3 this past spring and my daughter is now 9 weeks old and for my walks, I've had DD in the beco carrier and I push DS in the bob stroller. We LOVE the bob! It's the only stroller we use but it'd be nice to have a double. Is 3 too old to be in a stroller?
It's just super convenient when I'm alone to not have to chase after him! Should I find one on Craigslist or just keep DD in the carrier while DS is in the single bob? Stop using the running stroller all together? If he was any younger than 3, I could justify buying a new double...

What are your thoughts/ideas?