yes.

replace tube every 12mths.

reapply every 3 - 4 hours yes, usall it has an exp. date. i was always told to get new cream each year as it loses spf but now i buy spf50 for my kids so i use that bottle the following year for me! Yes, in both senses.

If you keep a bottle of suncream longer than about 1 year, it will generally congeal into a strange consistency and no longer be usable.

If you apply suncream, it wears off quite quickly. You need to reapply it every couple of hours or so.

Hope this helps.