A really good garage door opener is less than $200, so over 10 years, you spent about $20 a year, or (for sake of ease,) $2 a month. That works out to about a penny per button push, so after 20,000 travels of the opener motor, I'd say you got your money's worth.
Either you blocked the sensor eyes with the garden rake again, the tension in the door springs hasn't been adjusted in so long that the motors burned out, you had a freak lightning strike or power surge that fried your opener remote electronics, or IT'S OLD.
If you don't solve it with one of those things, buy a new opener. It's cheaper than having someone out to fix it.
You could also call Chamberlain (they make your opener) and ask them. They might have some solutions for you and you can have a live conversation with them.