Mr. Flipper--I'll give you a whole family of stats to add, here's to hoping I've got all the math right
My family began studying in 1970 and became fully active (all the meetings and FS) in 1971.
My mom: baptized in 1972, age 32. Became inactive in the early '80's due to "illness". Officially disassociated in 1993 at age 53. That breaks down to 10 years very active and 11 years of inactive but believing.
My dad: baptized in 1972, age 36. Resigned as an elder and became inactive in 1993 at age 57. 21 years in.
As a side note: My dad continued to attend meetings and serve as an elder for 11 years w/o my mom. During that time his congregation split a couple of times and eventually many of the "friends" in the cong were surprised to discover my dad was married. Going to show just how interested they were in helping her.
My brother: baptized in 1974 at age 15. Became inactive in 1990 at age 31, to the great disappointment of his uber-witness wife. In 2002 after 17 years of marriage and with the encouragement of the elders, she walked out on him. Spiritual endangerment, ya know. He as in 19 years.
My ex-husband and I were the lone holdouts
I was baptized in 1975 (whew! just in time!) at age 13. After being inactive for over a year, made the mental break in 1997, age 35. 26 years in.
My ex: Studied for about a year in '72, began studying a second time in 1974. Baptized in 1975 at age 21. Out in 1997, age 43. 23 years in.