Course you can, they're computers! Obviously it depends on what your needs and interests are on whether a Mac or pc is best for you. In my case its been a general workhorse, used for leisure, work and studying. Most software/apps these days have a Mac version, I can't think of anything I've wanted to do that I've not been able to. Currently the main use is for running family history software and scanning and sorting out years of photos and family documents. If you're a gamer or like fiddling with the insides of computers then Macs probably aren't for you.
In my case, even I'm surprised that this computer is still going strong after 10 years - and I mean strong, not just limping along like a 10-year old windows machine would be doing. I suspect the limiting factor will be software updates that don't support the processor, but as long as it works as good as (if not better) than my "new" work laptop then I'll keep it going.