1) If you and/or your husband have mobility issues as you age, there is no better way to get good exercise than in a pool. In that sense, a pool would be an investment in your health. Or you could just join your local YMCA.
2) Is the pool heated or unheated? If it is heated, you can use it year round, not just during the months that it is warm enough from the sun. But if you heat it, it becomes an even bigger expense since you’re both heating it and filtering it. My mom’s pool in central FL was unheated and for half the year it was like a warm bath; the other half year, it was too cold to swim in.