Can't install from npm

> $ npm install -g markdown-pdf
> npm WARN npm npm does not support Node.js v10.15.2
> npm WARN npm You should probably upgrade to a newer version of node as we
> npm WARN npm can't make any promises that npm will work with this version.
> npm WARN npm Supported releases of Node.js are the latest release of 4, 6, 7, 8, 9.
> npm WARN npm You can find the latest version at https://nodejs.org/
> npm WARN deprecated phantomjs-prebuilt@2.1.16: this package is now deprecated
> npm WARN deprecated request@2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142
> npm WARN checkPermissions Missing write access to /usr/local/lib
> npm ERR! path /usr/local/lib
> npm ERR! code EACCES
> npm ERR! errno -13
> npm ERR! syscall access
> npm ERR! Error: EACCES: permission denied, access '/usr/local/lib'
> npm ERR! { [Error: EACCES: permission denied, access '/usr/local/lib']
> npm ERR! stack:
> npm ERR! 'Error: EACCES: permission denied, access \'/usr/local/lib\'',
> npm ERR! errno: -13,
> npm ERR! code: 'EACCES',
> npm ERR! syscall: 'access',
> npm ERR! path: '/usr/local/lib' }
> npm ERR!
> npm ERR! The operation was rejected by your operating system.
> npm ERR! It is likely you do not have the permissions to access this file as the current user
> npm ERR!
> npm ERR! If you believe this might be a permissions issue, please double-check the
> npm ERR! permissions of the file and its containing directories, or try running
> npm ERR! the command again as root/Administrator (though this is not recommended).
>
> npm ERR! A complete log of this run can be found in:
> npm ERR! /home/$USER/.npm/_logs/2020-03-12T18_45_58_350Z-debug.log