We're also in a 60's semi. The stairs are on opposite sides of the party wall. The toilet, kitchen, and the front bedroom share a party wall.
We've had many neighbours during the 40 years we've lived here, and there's always been noise except for a lone male who rented..
The current tenants have 3 children, and they're like a herd of elephants running up and down stairs, and the high pitched screaming while they play in the adjoining bedroom is very clear to hear.
Also in the past a family who had a baby sleeping in the adjoining front bedroom, always woke us in the night with his crying.
Even while sitting in the living room which has no adjoining walls.. with the hallways between it and the neighbours hallways, with the living room door ajar , the noise of the children can be heard over the Television.. unless we firmly close the door.
Equally the flush of the toilet through the adjoining wall can be heard clearly.. during the day and very much more so at night , as can any conversation that people are having in either toilet or anyone talking on the top landing of either home.