This is crystallized vs fluid intelligence in IQ terms. Your fluid intelligence (short term memory/spatial vizualiation/problem solving) starts going down aroun

This is crystallized vs fluid intelligence in IQ terms. Your fluid intelligence (short term memory/spatial vizualiation/problem solving) starts going down around 25 and you crystallized intelligence (long term memory) starts going down around 60: https://oxfordre.com/economics/doc/10.1093/acrefore/9780190625979.001.0001/acrefore-9780190625979-e-250-graphic-001-full.gif https://oxfordre.com/economics/doc/10.1093/acrefore/97801906...