Edouard Louis Joseph, baron Merckx (Dutch pronunciation: ['merks]; born 17 June 1945), better known as Eddy Merckx, is a Belgian former professional road and track bicycle racer who is widely seen as the most successful rider in the history of competitive cycling. His victories include an unequalled eleven Grand Tours (five Tours of France, five Tours of Italy, and a Tour of Spain), all of the five Monuments, three World Championships, the hour record, every major one-day race other than Paris-Tours, and extensive victories on the track. Born in Meensel-Kiezegem, Brabant, Belgium, he grew up in Woluwe-Saint-Pierre where his parents ran a grocery store. He played several sports, but found his true passion in cycling.

Merckx opened the 1967 campaign with two stage victories at the Giro di Sardegna. He followed these successes by entering Paris-Nice where he won the second stage and took the race lead. Two stages later, a teammate, Tom Simpson, attacked with several other riders on a climb and was nearly 20 minutes ahead of Merckx, who remained in a group behind. Merckx attacked two days later on a climb 70 km into the stage. He was able to establish a firm advantage, but obeyed orders from his manager to wait for the chasing Simpson. Merckx won the stage, while Simpson secured his overall victory.  On 18 March, Merckx started the Milan-San Remo and was seen as a 120-1 favorite to win the race. He attacked on the Capo Berta and again on the Poggio, leaving only Gianni Motta with him. The two slowed their pace and were joined by two more riders. Merckx won the four-man sprint to the finish. His next victory came in La Fleche Wallonne after he missed out on an early break, caught up to it, and attacked from it to win the race. On 20 May, he started the Giro d'Italia, his first Grand Tour. He won the twelfth and fourteenth stages en route to finishing ninth in the general classification.  He signed with Faema on 2 September for ten years worth 400,000 Belgian francs. He chose to switch over in order to be in complete control over the team he was racing for. In addition, he would not have to pay for various expenses that came with racing such as wheels and tires. The next day, Merckx started the men's road race at the 1967 UCI Road World Championships in Heerlen, Netherlands. The course consisted of ten laps of a circuit. Motta attacked on the first lap and was joined by Merckx and five other riders. The group thinned to five as they reached the finish line where Merckx was able to out-sprint Jan Janssen for first place. In doing so, he became the third rider to win the world road race amateur and professional titles. By winning the race he earned the right to wear the rainbow jersey as world champion.Answer this question using a quote from the following article:

How long did his career in cycling last or was it 1967?