Social Security Question...follow up to BP Money Podcast #344

[Julie Rimola]

Jeremy Keil mentioned that they expect the social security payment amounts to drop to 75% (of current amounts) in 2034. I have a few points of clarification I'm hoping someone can help me with.  Does that change (the drop to 75%) for everyone or just those who start to draw in year 2034 or later? Ie. a) will it effect my mom who has been drawing for years now, and b) will it effect me if I were to start drawing in 2032 for example?
I will be turning 70 in 2034, so the exact timing is important to me. I had been thinking to wait and start my draw at age 70, since that's the highest amount that would be available (by current settings/rules). But depending on answer to above question I'm wondering if I should start to draw at age 69 (to beat the 2034 year, or at 62 since the 75% (estimated drop) would end up being the same as the lower amount that would normally happen at 62 (compared to 70)?
I also understand that the year stated (2024) is probably just an estimate, so not sure if I should make my plans around that. But basically, I'd like to add social security into my financial planning and want to get a semi-accurate estimate to input now that I'm feeling more confident that it won't be gone completely.  

Help, please, and thank you :)