We want to begin a weight lifting program to complement the aerobic exercises we do. We want to exercise at home. No special weight training equipment is needed for senior citizens. Lifting any weight from a bag of rice, to barbells and dumbbells or weights attached to machines will achieve results. However, there is a lot to be said for weight machines.
Machines tend to be safer than free weights.
They allow weight to be increased in small increments. And some folks find machines easier to work with and more fun. But a multi-station home unit is fairly expensive. If you decide to use free weights, visit your library and check out several books on the subject. There are standard lifting techniques that are appropriate for all ages.