Everyone is different. If you sleep less than when you were younger but still feel rested and energetic during the day, it might be that you now need less sleep.
But if you have noticed that your lack of sleep affects you during the day, tell your doctor. There are steps you can take to get better rest. Many are simple tweaks to your daily routine, like setting a regular bedtime, being more active, and taking steps to ease your mind before you hit the hay.