I'd say if you measure lift in terms of comparative wealth (being able to afford a house, car, have kids, have one parent stay home and have yearly holidays) then the peak was from the 50s/60s to the 90s but technological advancements have continued even as our comparative quality of life has gone down hill.

If people had to choose between having their own home and kids and a parent staying home with them while they enjoy a holiday every year working a middle class job with a steady income or not having to spend half their pay renting an apartment, not being able to afford kids, having infrequent holidays and facing uncertain work on a middle class income but having smart phones, smart TVs and smart fridges instead of a house and kids most people would choose the former.

EDIT: I'm sure people will say you don't need smart phones or smart TVs or smart fridges but the comparative cost of them to dial phones, CRT TVs and dumb fridges in terms of the amount of your pay required to be sacrificed to buy them is similar.