Need Advice on investing in a condo thats built in 1960s

[George Yagappa]

I am trying to invest in my first rental property at Denver Location most of the properties seem to be built in the 1960s and 1970s. I ran the calculations with the rent I would be getting at that location, The numbers seem to be aligning with a surplus of 100 dollars 
I am having mixed thoughts about these properties. Would getting an old condo increase the odds of major maintenance issues