Hello,
Welcome to healthcare magic.
I understand from your query that you are concerned about 
rosacea and ageing skin.
You have not mentioned your age.
As a moisturizer, you could use one containing colloidal  oatmeal like aveeno. apply immediately after washing your face when it is still damp and reapply often.
You could look for a cream containing 
retinol. It will help for both your rosacea and act as an anti-ageing cream. However, this can worsen your dryness. Hence use only for 
short periods initially for a few months ( 1 -2 hours) and gradually increase the duration of contact,
For sagging skin, there are options like thread lift, fillers and 
botox. You need a complete evaluation by a 
dermatologist who will suggest the right treatment or a combination of treatments for you.
Hope this helps you.
Take care.