In this task, you are given a sentence in English, and your task is to translate it into Persian.

ingenuity, and willpower to disguise the seventy six years he had completed in March,

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
مهارت بسیاری از خود نشان داده بود، با اراده‌ای آهنین موفق شده بود کسی نفهمد که او در ماه مارس گذشته، هفتاد و شش ساله شده است.