Getting that all over toned look

I am 48 years old and weigh approximately 150lbs. I used to be a fitness instructor but because I am now studying, don’t have the time. However, I work out three/four times a week when I can. This consists of walking/running 30 mins followed by weight training. My body is in reasonable shape though I notice that despite being toned, I am still caryying some excess body fat (age?) I also notice that my upper body is more defined (arms, shoulders back and chest) but I can’t get the same definition for my legs and abs. Any suggestions?