age and oils

I want to mix some rose and oud, what ratio should I use? How will the mix change with time(does one smell eventually become more prominent)? Thanks!

So yeah, I have the Santalum. album oil from @Guru_AromatiX (The Tea Guru) the basic one he sells (https://www.etsy.com/uk/listing/1070988145/indian-sandalwood-oil-santalum-album?ref=yr_purchases), just straight Indian Karnataka Sandalwood oil, and I also have his Sumba, but I still have tons of...

Aging and worth of oils proceed together. Both quality and price increase with the passage of time. Fresh oil is generally considered still carrying sharp edges and an unsettled aroma. I myself am of the same view. After spending some years with the oils, I have realized 'aging' may cause some...