A script that collects and prints info about the age of all ruby gems in your project, see https://dev.to/borama/how-old-are-dependencies-in-your-ruby-project-3jia

ruby_gems_age.rb

#!/bin/env ruby
#
# Collects info about the age of all gems in the project
#
require "json"
require "date"

bundle = `bundle list`

yearly_stats = {}
bundle.split(/\n/).each do |line|
  next unless line =~ /\s+\*\s+[^ ]+\s+\(.*\)/

  gem_name, gem_version = /\s+\*\s+([^ ]+)\s+\((.*)\)/.match(line).to_a[1..-1]

  begin
    gem_json = `curl -s https://rubygems.org/api/v2/rubygems/#{gem_name}/versions/#{gem_version}.json`
    built_at = JSON.parse(gem_json)["built_at"]
    release_date = Date.parse(built_at).to_date

    puts "#{gem_name},#{gem_version},#{release_date.strftime("%Y-%m-%d")}"

    release_year = release_date.strftime("%Y")
    yearly_stats[release_year] ||= { count: 0, gems: [] }
    yearly_stats[release_year][:count] += 1
    yearly_stats[release_year][:gems] << gem_name
  rescue => e
    puts "#{gem_name},#{gem_version},???"
  end
end

puts
puts "Yearly summary:"
yearly_stats.sort.each do |year, data|
  puts "#{year},#{data[:count]},#{data[:gems].join(' ')}"
end

This script will find out the age (date of release) of all gems in your project and print this out together with yearly summary stats. The format of both output parts usually obeys the CSV format so that you can paste it in your spreadsheet and make a chart of it.

Typical output:

$ ruby ruby_gems_age.rb
actioncable,6.0.0.rc1,2019-04-24
actionmailbox,6.0.0.rc1,2019-04-24
actionmailer,6.0.0.rc1,2019-04-24
actionpack,6.0.0.rc1,2019-04-24
...
webpacker,3.5.5,2018-07-09
websocket-driver,0.7.1,2019-06-10
websocket-extensions,0.1.4,2019-06-10
will_paginate,3.1.7,2019-03-18
xpath,3.2.0,2018-10-15
zeitwerk,2.1.9,2019-07-16

Yearly summary:
2014,8,acts-as-dag ...
2015,6,coffee-script ...
...
2019,115,actioncable ...

See the article for more details.