I plan to delay taking SSA benefits until age (70) in order to maximize the benefit. Will my wife's Spousal Benefit increase after her FRA, or does it remain at 50% of my FRA at 66? If the latter is the case, I imagine it's best to file along with my wife at her FRA and then suspend my benefit until age 70? She reaches FRA in Feb 2018 and I have reached it already. Thank you.