Get deployment age or last restart time for a pod using Prometheus

Hello All,
I am trying to develop dashboards on Grafana that tells the status of different pods with the help of kube labels. Eg: I am able to get the restarts using this label: kube_deployment_status_observed_generation

What i want is the age, For a deployment we can get the age on kuberenetes cluster using,
kubectl get deployments
deployemnt-test-state 1/1 1 1 6d2h

I want this same age to be shown in Grafana but I am not able to find this “age” anywhere in any label.

Can anyone help me where and how i can get these variables.