The Oldest Disciple: Farming Intimacy to Become Immortal Novel

At 78 years old, with one foot in the grave and zero achievements, Li Meng awakens a System that turns intimacy into immortality.
He has no time for meditation. He has no talent for swordsmanship. But in the infamous Joyous Union Sect, he has the perfect cheat code.
[Ding! System Activated.] [Core Mechanic: Convert physical contact with female cultivators into EXP.]
Holding Hands: +10 EXP.
A Passionate Kiss: +100 EXP.
Dual Cultivation (Going all the way): LEVEL UP!
Realizing his advantage, Li Meng discards his dignity to survive. He adopts the persona of a harmless, benevolent "Grandpa" figure to lower the guards of the sect's beautiful yet dangerous women.
To the outside world, he is the kind-hearted "Wealth-Scattering Senior Brother." In reality, he is a cunning old fox hunting for his next source of cultivation.
From the arrogant Senior Aunt to the innocent Junior Sister, Li Meng will help them solve their problems... in exchange for a night of "cultivation."Why read this?
Unique MC: An experienced, manipulative old man, not a naive teenager.
System Progression: Clear stats, alchemy mastery, and talisman crafting.
Harem Building: Gotta catch 'em all!
Weak to Strong: Defying death to stand at the apex.