Hearing? If you haven't trashed it with man-made sound, your hearing is probably better than you think it is. Have a baby in the house and you will become acutely aware of small noises unique to it. Take your kids to a playground and you may find that you can hear THEIR voices in the din.
Scenting? This is harder, but if you can avoid the harsher odors, you may find you become aware of the more subtle scents. A few are even more subtle. Some years ago, Psychology Today had an article suggesting how our body odors are perceived as pleasant and sexy to another person is a highly selective process. We usually smell best to a person whose genetically based immunity to disease differs most from our own. This could benefit you in the long run, making for stronger, healthier children.
Women who live together, in a house or a dormitory, often find that their menstrual cycles start to coincide. This has been attributed to pheromone production, scents of which the women are unaware.
I can't find it now, but in another study, the unnoticed scent of a woman menstruating, and that of a dried perspiration on a man were found to be stimulating to their opposite genders.
A fact I picked up from the days I taught photojournalism is that our pupils enlarge when we are interested or sexually aroused. Chinese jade merchants were known to use this unconscious change to encourage the selection of specific jewelry; Italian woman were known to take a narcotic which enlarged their pupils to make them appear more sensual: "belladonna."
Even today, I'd bet that a lot of advertising of women, aimed at men, have air-brushed pupils, and swollen or "pouty" lips to stimulate interest. I used examples to help my students focus on what they were seeing--sights that went past what Howard referred to as "filters," and went to the instinctual response of the human animal.
There's more, but try having a purposeless walk in the woods, plains, whatever...away from the madding crowd...walk slowly and look, listen, and feel. A lot of the senses that have been "filtered" are still intact and as you become aware of them, you become aware.
Or go turkey hunting...with or without a gun...just lean back against a tree and be still... the woods becomes alive, sounds become more vivid, distinctive, and remarkable as you hear the world you are in.
When the planes were grounded after 9/11, the silence in the skies was intimidating, even out here where gawd lost his sandals.
Be well and safe.