My mother is a 5 of Clubs and my father was a 5 of Hearts. She has Borderline Personality Disorder and my father was her enabler. He was the same age as her. He died in 2011 and my mother is still alive and kicking at 91. She was high-functioning and a hard worker but now she is an alcoholic and lives with my half-brother and his wife who are her caregivers.
When she turned 52 (Ace of Spades) she left my dad and ran off with a high-school boyfriend to live in California. That did not work out, but the point is her life drastically changed at age 52/Ace of Spades period.
As far as specializing in something she truly loved (King of Hearts Earth Card), she got a degree in Spanish and Education, taught that for awhile then later became an administrative assistant for doctors. She gave tough love or rather ruined most of her close relationships because of her emotional dysregulation and cruelty, so that may be how the K of Hearts showed up. She also has a Moon/Saturn/Rahu conjunction is 5 of Spades/Jupiter card, so that really is a massive blemish on her chart/spread overall.