I think I had a stint of 14-15 years as plat and I too am at less than 1,2M avios. Even if you count 20 years x 150k and reach 3 000 000 old points, do note that there were ways to requalify for plat without reaching 150k. So yeah, I don't find it surprising if someone even with 20 platinum-cards in a row did not get any lifetime tier.

And after the change-over, the theory time to reach LTG is 25 years of platinum (2M/80k). Those who didn't make the cut before, will probably have an even slower climb towards the LT-tiers. FFlash and me would be looking at 10 more years as plats in the revbased system to reach LTG, putting us at 25+ years to LTG. LTP not physical possible to reach unless public healthcare gets in on Putler's donor-organ business.

Or put this way - I am likely to reach Lifetime Diamond (top tier) in EB in 5 years. If I took all those flights with AY instead, where I have a headstart of 1,2M avios, I might reach 75% of AY LTG...