I’m not as young as I used to be, and standing in one place for any length of time makes my legs

[No Vested Interest]

2. Support stockings - available for both men & women- help.

They are available in knee length. A good pair is not inexpensive, but worth the expense if you're on your feet frequently.
If handled gently, they can last a long time. If worn under slacks, a slight run won't matter.

The can be purchased in some large grocery stores, large drug stores or a medical supply store.
They help keep blood flowing ip & down the veins and arteries.

Also, slighting bending the leg at the knee from time to time relieves the pressure on knees and leg muscles.