100+ year old houses?

[Michael Healy]

I admit it: I love old houses, especially those built in the early 1900s. Yet I always hear savvy investor types talking about only investing in post 1990s houses or similar criteria. I know real estate investing is about, well, investing. But I wonder if anyone has been financially successful while pursuing older homes? Lead paint always seems to be a huge concern in these homes, as well as fuel efficiency. Perspectives from old home investors appreciated. Michael P.s this is relevant because I'm in contract on a multifamily built in early 1900s with lots of original detail, windows, etc. I know it's going to be a bear to restore and maintain but I can't help myself.