well I walk much slower since I walk with small children and I guess it took its toll on even when I walk alone. what's the point reversing to your regular high

well I walk much slower since I walk with small children and I guess it took its toll on even when I walk alone. what's the point reversing to your regular high speed when later you need to drag with children? it's just easier to get used to lower speed. many people at 45 could still have like 5yo child (2nd) or even younger or was the study done only on childless people?