>I would never live in a home built before 1978. Almost certainly that home is full of lead-based paint and asbestos.
We're closing in on 50 years past the 1979 lead-based paint cutoff - the vast majority of homes in my area, and I extrapolate that likely most areas, have been remediated. With asbestos - probably the worst issue in my area is that if you have asbestos shingles you want to remove they are stinking heavy and so cost a lot to dump. I live in a 1915 home that is a great example of houses in my area - has gone through multiple renovations in that time such that the guts are fundamentally new. Probably the biggest issue with these older homes is insulation, as unless you truly take them down to the studs, they are never going to be as airtight as modern homes.
We're closing in on 50 years past the 1979 lead-based paint cutoff - the vast majority of homes in my area, and I extrapolate that likely most areas, have been remediated. With asbestos - probably the worst issue in my area is that if you have asbestos shingles you want to remove they are stinking heavy and so cost a lot to dump. I live in a 1915 home that is a great example of houses in my area - has gone through multiple renovations in that time such that the guts are fundamentally new. Probably the biggest issue with these older homes is insulation, as unless you truly take them down to the studs, they are never going to be as airtight as modern homes.