My grandfather and grandmother, who worked, raised 4 children in
this house . He was a chemical engineer with a university degree in the 1960's and 1970's - it was a 3-bed, ~1,500sf home in what was a normally middle-class area at the time. They owned two modest cars, didn't really take vacations, didn't have large amounts of consumer spending, etc.. and that was on a university-educated factory floor manager's income with a two-income household.
It's now a fairly wealthy area of Scarborough, but things have changed over time and as I said, real estate is the one thing that has experienced real declines in the GTA and Vancouver specifically. That type of job and income setup today would be in a house twice the size, probably even in the GTA, with two luxury cars, large annual vacations, and a huge disposable income.
What was considered upper middle class back then, two cars and a mid-sized detached home and a small disposable income, is now achievable by most middle income households. Upper middle class incomes these days involve houses twice as large with luxury cars and huge disposable incomes.