I have typically overplucked eyebrows and, as I'm late 50's, they are starting to lose shape a bit. So was just wondering, which is better, waxing or threading? I had them waxed and tinted during the summer and liked how they looked but I thought the waxing was a bit harsh on my skin, as the skin has gone a little less taut than it used to be. So is threading gentler on the skin?