Is it normal to have cracks around windows in a 1959 build house?

I got a property it was build in 1959 around window lintels got cracks they don't look new cracks.There was couple hair cracks and a cut it to refill but looks like they ben field before and they look a bet bigger behind the plaster they look like old cracks and ma by ben there for years does any one come a cross this before?Is it anything to wary?