Blown-in insulation typically lasts 20 to 30 years, but fiberglass and rockwool can last up to 50 years, though effectiveness may decrease over time.
Fiberglass insulation usually needs replacement after 15-20 years as it can become dirty, wet, moldy, and less effective.
Foam boards are highly effective for insulating exterior walls, basement walls, attic hatches, and other parts of your home.