吾十有五而誌於學, I was determined to become an artist at 15.
三十而立,i brought my artistic training to completion at 30.
四十而不惑,i established a personal style at 40
五十而知天命,my art reached spiritual maturity at 50.
六十而耳順, ( not interpreted)
七十而從心所欲,不逾矩。I finally acquired complete freedom in expression at 70.
八大山人差不多就這進程。