Is it possible to upgrade a 10 year old laptop?

Could you elaborate on the possibility of upgrading a 10-year-old laptop? Are there any limitations or constraints that one should be aware of before attempting such an upgrade? Additionally, what are some of the key factors to consider when assessing the feasibility of an upgrade, such as the laptop's current hardware specifications and the availability of compatible upgrades? Is it financially viable to invest in upgrades for such an old device, or would it be more cost-effective to purchase a new laptop altogether?